International Journal of Precision Engineering and Manufacturing-Green Technology
Harnessing energy from alternative energy source has been recorded since early history. Renewable energy is abundantly found anywhere, free of cost and has non-polluting characteristics. However, these energy sources are based on the weather condition and possess inherited intermittent nature, which hinders stable power supply. Combining multiple renewable energy resources can be a possible solution...
This study considers the performance of a direct methanol fuel cell (DMFC) unit for the various compression ratios of a gas diffusion layer (GDL) on the cathode side. A performance of fuel cells is significantly influenced by the compression ratio of the GDL. The compression ratio of the GDL can be directly controlled by the concentration compression force at the central area of the cell and gasket...
It is important to establish a new approach of creating such value-added products as craftworks or applied arts, different from traditional way of achieving products with high quality and low price. Thus, the study deals with the first trial of creating artistic product shapes by means of multi-axis controlled multi-tasking machine tools or multi-axis controlled machining centers on the basis of mechanical...
In addition to the steps taken to ensure optimal efficiency in industry, significant effort has been directed towards the green and sustainable manufacturing practices. In this paper, we review conventional and state-of-the-art manufacturing technologies to provide insight into energy consumption at the processing level. In the review, collected energy data were summarized for three manufacturing...
Recently, efficient use of energy resources has become a very critical issue in most industries due to various reasons such as the high price of energy resources and environmental problems. The printed circuit board (PCB) industry is known as one of the major manufacturing industries that consumes a moderately large amount of electricity. Of all PCB manufacturing processes, the photolithography process...
Unmanned Aerial Vehicles (UAVs) have been developed to perform various military and civilian applications, such as reconnaissance, attack missions, surveillance of pipelines, and interplanetary exploration. The present research is motivated by the need to develop a fast adaptable UAV design technologies for agile, fuel efficient, and flexible structures that are capable of adapting and operating in...
Nano particle deposition system (NPDS) is one of dry particle spray methods such as cold spray and aerosol deposition. It can be used to build structures from metals, ceramics, and nanomaterials without any solvents at room temperature and under low vacuum conditions, reducing energy consumption. Recent advances in dry particle spray techniques, including NPDS, have demonstrated their use with advanced...
To improve the adhesion and wetting between the abaca fibers and matrix, the surface of abaca fabric was modified using plasma polymerization. Different plasma exposure times were conducted to determine the effect of plasma treatment on the properties of the composites. A combination of plasma and other surface modification processes was also investigated to determine whether double treatments could...
Given the stricter environmental regulations and rising oil prices, means of transportation based on eco-friendly fuel are drawing increased attention. Electric propulsion systems (EPSs) have been applied to various means of transportation, including cars, and many studies have examined ships equipped with EPSs. Generally, because of the low energy density of the battery, EPS-equipped vehicles experience...
This study uses two FEM simulations based on deform 3D and superform commercial software assuming coulomb friction to explore the plastic behavior in rotating compression forming of double-layer bounded clad ring. The rotating compression forming can reduce the compressive force and make the deformation uniform. Effects of the frictional coefficient, shear yield stress ratio, rotating angular velocity,...
Applying mechanical pressure on a solid boundary contact using a thin porous layer has been found to reduce the pore size and porosity near the wall region, limiting the flow and mass transport properties. This reduction may affect the overall performance of devices such as the electroosmotic pump that generally uses a porous media with constant porosity in an electric field. Therefore, to improve...
This paper describes a virtual machine tool (VMT) that can be used to estimate the energy consumption of machine tools at the component level. The VMT was designed by focusing on accurately estimating the dynamic behavior and energy consumption of the servo system, which has a major impact on the total energy consumption. Simulation models of the controller and feed drive were constructed. The energy...
Localized charge transfer reactions induced by the external bias were observed near the electrode-electrolyte interfaces by Kevin probe microscopy. Spatially resolved potential measurements revealed the localized charge accumulation and rearrangement driven by the external bias, which were ascribed to oxidation and reduction of the oxide surface. This in situ measurement of charge distribution with...
Slurry containing SiC powder and oil is used to cut ingots with a wire in a solar cell wafering process. The slurry, which is generally recycled due to its high price, produces a residue known as sludge during the recycling process. The sludge is mainly composed of SiC, Si, and oil. This study proposed a method to remove Si and oil from sludge to obtain a high-purity SiC powder of approximately 98...
The influence of the area difference between the current collector and the thin-film-processed cathode on the performance evaluation of the solid oxide fuel cell (SOFC) is investigated. Two 2 cm by 2 cm anode supported SOFCs with a 1 cm by 1 cm cathode (Cell-1.0) and a 1.5 cm by 1.5 cm cathode (Cell-2.25) are fabricated and the performances are measured in a button cell test set-up with a cathode...
Ultrasonic imprinting is a novel process in which micro-patterns can be replicated on thermoplastic polymer with short processing time and low energy consumption. Ultrasonic imprinting uses ultrasonic vibration energy to soften thermoplastic polymer, and to replicate micro-patterns on the softened polymer surface from a patterned horn or mold. In this study, a new patterning method based on ultrasonic...
Comprehensive analyses on the complex ion transport of co-planar interdigitated microelectrode arrays in solid-state ionic devices were carried out using finite element and analytical methods. We found that the ion flux between anode and cathode was constricted on the edges of both electrodes. Based on these results, we defined/analyzed the effective length and ohmic area-specific-resistance of various...
Inspired by the remarkable adhesion properties of gecko lizards, bio-inspired dry adhesives with smart adhesion properties have been developed in the last decade. Compared to earlier dry adhesives, the recently developed ones exhibit excellent adhesion strength, smart directional adhesion, and structural robustness. With these unique adhesion properties, bio-inspired dry adhesive pads have strong...
In this study, effect of fiber morphology on orientation is evaluated. Therefore, intersection angle for chopped strand, fiber length, and structure of fiber mat is changed to make the corresponding specimens and the relationship between compression ratio and fiber orientation is derived. Factors for controlling flow of glass fiber are glass fiber and matrix. 3 types of specimens, they are heated...